Entry from British & World English dictionary
Definition of phantom circuit in English:
An arrangement of telegraph or other electric wires equivalent to an extra circuit.
- If a telephone company was not happy with a gain of one circuit from two pairs, they could always take two phantom circuits, additional repeat coils and "phantom the phantoms" to obtain seven circuits over four pairs of wire.
- Engineers commonly called duplexed telephone circuits ‘phantom circuits’ or simply ‘phantoms.’
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